Abstract: A putty plate 30 is formed with an edge 32 in a continuous pattern to define the perimeter of the plate. A base wall of the putty plate 30 includes a floor 40 on one side of the plate 30 and a ceiling 78 on the other side of the plate. Holes 48, 60 and 62 are formed through the base wall. Four sets of ribs 52 are formed integrally from the floor 40 on the one side of the plate 30 while sets of ribs 84 are formed integrally from the ceiling 78 on the other side of the plate. Ribs 46 are formed about the holes 48 in a hexagonal configuration integrally from the floor 40 of the plate 30. Circular ribs 80 are formed about the holes 48 integrally from the ceiling 78 on the other side of the plate 30. A continuous groove 68 is formed in the base wall between the edge 32 and the ceiling 78 to define the perimeter of the ceiling. Two other putty plates 108 and 200 are formed with structure similar to the structure of the plate 30. The three putty plates 30, 108 and 200 are composed of a nylon material.

Abstract: An acceleration responsive device 30 includes a support 34 which supports a rod 46 between two spaced portions of the support. A weighted disc 48 is mounted for movement on the rod and is held by a spring 128 at one end of the rod 46. An indicator 50 is also mounted for movement on the rod 46 adjacent disc 48. A tube 62 is coupled to support 34 to facilitate swinging movement of the device 30 where, due to the acceleration thereof, disc 48 is moved along rod 46 and pushes indicator 50 along the rod. When the swinging movement ceases, disc 48 is returned to the one end of rod 46 and indicator 50 remains at the position to which it was moved. A scale reading of a decal 89 adjacent the moved indicator 50 provides a indication of the acceleration attained during the swinging of device 30. This reading can be applied to a graph to assist the user of device 30 in the selection of golf clubs having a shaft stiffness most appropriate for the user.

Abstract: A locator 20 for facilitating the location of the center of gravity of an object such as a golf club head 130 includes a balancing member 42 having a rod 88 extending in a first direction from the member and a threaded rod 100 extending from the member in a second direction opposite the first direction. An adjustable weight 94 is located on rod 88 and a holder 110 for supporting an adaptor 138 and club head 130 is located on a free end of rod 100. Adaptor 138 with club head 130 are positionable in at least three different positions on holder 110 representative of the "X", "Y" and "Z" coordinates of the center of gravity of the club head. When club head 130 is located in each of the three positions, balancing member becomes unbalanced. By adjustment of weight 94 on rod 88, balancing member becomes balanced. Various distance measurements are taken and, by use of a moment-summing equation, unknown distances are determined to locate the "X", "Y " and "Z" coordinates of the center of gravity of club head 130.